refactor(exx): ESolver_KS owns Exx_Info value object

Change ESolver_KS from holding a pointer to GlobalC::exx_info to owning
its own Exx_Info value member (exx_info_obj_). The constructor copies
the content from GlobalC::exx_info (initialized by Input_Conv::Convert)
into the owned object, so ESolver internals now operate on their own
copy. The exx_info_ pointer still points to exx_info_obj_ for uniform
access, preserving the parameter-passing pattern established in the
previous commits.

This breaks the runtime dependency on GlobalC::exx_info from ESolver
internals and prepares for removing the global entirely in the next
commit. GlobalC::exx_info is kept for now as other modules still
reference it during the transition.

Author: abacus_fixer

source/source_esolver/esolver_ks.cpp

@@ -21,7 +21,11 @@ namespace ModuleESolver
 
 ESolver_KS::ESolver_KS()
 {
-    exx_info_ = &GlobalC::exx_info;
+    // ESolver owns its own Exx_Info object, copied from the global instance
+    // initialized by Input_Conv::Convert(). This breaks the dependency on
+    // GlobalC::exx_info from ESolver internals; the global will be removed
+    // in a follow-up commit.
+    exx_info_obj_ = GlobalC::exx_info;
 }
 
 

source/source_esolver/esolver_ks.h

@@ -7,12 +7,10 @@
 #include "source_estate/module_charge/charge_mixing.h" // use charge mixing
 #include "source_hamilt/hamilt.h"                      // use Hamiltonian
 #include "source_hamilt/hamilt_base.h"                 // use Hamiltonian base class
+#include "source_hamilt/module_xc/exx_info.h"          // ESolver owns Exx_Info value
 #include "source_lcao/module_dftu/dftu.h"              // mohan add 20251107
 #include "source_pw/module_pwdft/vnl_pw.h"
 
-/// forward declaration for EXX info bridge
-struct Exx_Info;
-
 namespace ModuleESolver
 {
 
@@ -77,8 +75,12 @@ class ESolver_KS : public ESolver_FP
     bool oscillate_esolver = false; // whether esolver is oscillated
     bool scf_nmax_flag = false;     // whether scf has reached nmax, mohan add 20250921
 
-    /// EXX info bridge, points to GlobalC::exx_info for now
-    Exx_Info* exx_info_ = nullptr;
+    /// EXX info owned by ESolver, copied from GlobalC::exx_info during construction.
+    /// Will become the sole owner after GlobalC::exx_info is removed.
+    Exx_Info exx_info_obj_;
+
+    /// Pointer to the owned Exx_Info object, for uniform access pattern.
+    Exx_Info* exx_info_ = &exx_info_obj_;
 };
 } // namespace ModuleESolver
 #endif